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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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Old 01-02-2007, 02:47 PM
fireranger40 fireranger40 is offline
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Erratic idle on 1989 f-350 / 351W

My 1989 dually has an erratic idle problem. I took apart the TBI unit along with the poweraid block. Cleaned them both with fuel injector cleaner and put back together. If I tap the accelerator it idles high until I "tap" The spring lever on the TBI unit itself and then the idle goes down to normal. I have tried using wd40 but the problem remains. I thought butterflies just open and close and thats it? I just replaced today the TPS and is still doing the same.

Could the butterflies be wore-out? Has anybody have this problem before? What it the solution?

Thank you for your help!!!
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Old 01-02-2007, 02:55 PM
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It sounds like the return spring is stuck and not allowing the butterflies to close all the way.

TBI is throttle body injection - something not found on Ford trucks, only on those ugly, bowtie-covered things.
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Old 01-02-2007, 07:24 PM
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Remove your IAC valve and clean it in some gasoline. That should solve your problem.
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Old 01-02-2007, 09:08 PM
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Thanks guys............IAC valve? Is that the other sensor located somewhat next to the TPS sensor? kinda long?


I noticed, if I tap the accelerator in an aggressive way the throttle goes back to normal until i touch the accelerator again that is.
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Old 01-03-2007, 12:02 PM
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Yes it is - but I doubt that's the problem based on your description. Did you adjust the TPS after you installed it?
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Old 01-03-2007, 12:02 PM
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